Modified holographic dark energy

In this work, motivated by the energy bound suggested by Cohen et al., we propose the modified holographic dark energy (MHDE) model. Choosing the IR cut-off L = R _CC and considering the parameterizations n ² = 2 - λ a, n ² = 2 - 3 λ a ² / (1 + 3 a ²) and n ² = 2 - λ a ² / (β + a ²), we derive all the physical quantities of the non-saturated MHDE model analytically. We find that the non-saturated MHDE models with the parameterizations n ² = 2 - λ a and n ² = 2 - 3 λ a ² / (1 + 3 a ²) are single-parameter models in practice. Also, we consider the cosmological constraints on the non-saturated MHDE, and find that it is well consistent with the observational data.